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comparison: media/libopus/silk/shell_coder.c

media/libopus/silk/shell_coder.c

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1 /***********************************************************************
2 Copyright (c) 2006-2011, Skype Limited. All rights reserved.
3 Redistribution and use in source and binary forms, with or without
4 modification, are permitted provided that the following conditions
5 are met:
6 - Redistributions of source code must retain the above copyright notice,
7 this list of conditions and the following disclaimer.
8 - Redistributions in binary form must reproduce the above copyright
9 notice, this list of conditions and the following disclaimer in the
10 documentation and/or other materials provided with the distribution.
11 - Neither the name of Internet Society, IETF or IETF Trust, nor the
12 names of specific contributors, may be used to endorse or promote
13 products derived from this software without specific prior written
14 permission.
15 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
19 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
20 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
21 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
24 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
25 POSSIBILITY OF SUCH DAMAGE.
26 ***********************************************************************/
27
28 #ifdef HAVE_CONFIG_H
29 #include "config.h"
30 #endif
31
32 #include "main.h"
33
34 /* shell coder; pulse-subframe length is hardcoded */
35
36 static OPUS_INLINE void combine_pulses(
37 opus_int *out, /* O combined pulses vector [len] */
38 const opus_int *in, /* I input vector [2 * len] */
39 const opus_int len /* I number of OUTPUT samples */
40 )
41 {
42 opus_int k;
43 for( k = 0; k < len; k++ ) {
44 out[ k ] = in[ 2 * k ] + in[ 2 * k + 1 ];
45 }
46 }
47
48 static OPUS_INLINE void encode_split(
49 ec_enc *psRangeEnc, /* I/O compressor data structure */
50 const opus_int p_child1, /* I pulse amplitude of first child subframe */
51 const opus_int p, /* I pulse amplitude of current subframe */
52 const opus_uint8 *shell_table /* I table of shell cdfs */
53 )
54 {
55 if( p > 0 ) {
56 ec_enc_icdf( psRangeEnc, p_child1, &shell_table[ silk_shell_code_table_offsets[ p ] ], 8 );
57 }
58 }
59
60 static OPUS_INLINE void decode_split(
61 opus_int *p_child1, /* O pulse amplitude of first child subframe */
62 opus_int *p_child2, /* O pulse amplitude of second child subframe */
63 ec_dec *psRangeDec, /* I/O Compressor data structure */
64 const opus_int p, /* I pulse amplitude of current subframe */
65 const opus_uint8 *shell_table /* I table of shell cdfs */
66 )
67 {
68 if( p > 0 ) {
69 p_child1[ 0 ] = ec_dec_icdf( psRangeDec, &shell_table[ silk_shell_code_table_offsets[ p ] ], 8 );
70 p_child2[ 0 ] = p - p_child1[ 0 ];
71 } else {
72 p_child1[ 0 ] = 0;
73 p_child2[ 0 ] = 0;
74 }
75 }
76
77 /* Shell encoder, operates on one shell code frame of 16 pulses */
78 void silk_shell_encoder(
79 ec_enc *psRangeEnc, /* I/O compressor data structure */
80 const opus_int *pulses0 /* I data: nonnegative pulse amplitudes */
81 )
82 {
83 opus_int pulses1[ 8 ], pulses2[ 4 ], pulses3[ 2 ], pulses4[ 1 ];
84
85 /* this function operates on one shell code frame of 16 pulses */
86 silk_assert( SHELL_CODEC_FRAME_LENGTH == 16 );
87
88 /* tree representation per pulse-subframe */
89 combine_pulses( pulses1, pulses0, 8 );
90 combine_pulses( pulses2, pulses1, 4 );
91 combine_pulses( pulses3, pulses2, 2 );
92 combine_pulses( pulses4, pulses3, 1 );
93
94 encode_split( psRangeEnc, pulses3[ 0 ], pulses4[ 0 ], silk_shell_code_table3 );
95
96 encode_split( psRangeEnc, pulses2[ 0 ], pulses3[ 0 ], silk_shell_code_table2 );
97
98 encode_split( psRangeEnc, pulses1[ 0 ], pulses2[ 0 ], silk_shell_code_table1 );
99 encode_split( psRangeEnc, pulses0[ 0 ], pulses1[ 0 ], silk_shell_code_table0 );
100 encode_split( psRangeEnc, pulses0[ 2 ], pulses1[ 1 ], silk_shell_code_table0 );
101
102 encode_split( psRangeEnc, pulses1[ 2 ], pulses2[ 1 ], silk_shell_code_table1 );
103 encode_split( psRangeEnc, pulses0[ 4 ], pulses1[ 2 ], silk_shell_code_table0 );
104 encode_split( psRangeEnc, pulses0[ 6 ], pulses1[ 3 ], silk_shell_code_table0 );
105
106 encode_split( psRangeEnc, pulses2[ 2 ], pulses3[ 1 ], silk_shell_code_table2 );
107
108 encode_split( psRangeEnc, pulses1[ 4 ], pulses2[ 2 ], silk_shell_code_table1 );
109 encode_split( psRangeEnc, pulses0[ 8 ], pulses1[ 4 ], silk_shell_code_table0 );
110 encode_split( psRangeEnc, pulses0[ 10 ], pulses1[ 5 ], silk_shell_code_table0 );
111
112 encode_split( psRangeEnc, pulses1[ 6 ], pulses2[ 3 ], silk_shell_code_table1 );
113 encode_split( psRangeEnc, pulses0[ 12 ], pulses1[ 6 ], silk_shell_code_table0 );
114 encode_split( psRangeEnc, pulses0[ 14 ], pulses1[ 7 ], silk_shell_code_table0 );
115 }
116
117
118 /* Shell decoder, operates on one shell code frame of 16 pulses */
119 void silk_shell_decoder(
120 opus_int *pulses0, /* O data: nonnegative pulse amplitudes */
121 ec_dec *psRangeDec, /* I/O Compressor data structure */
122 const opus_int pulses4 /* I number of pulses per pulse-subframe */
123 )
124 {
125 opus_int pulses3[ 2 ], pulses2[ 4 ], pulses1[ 8 ];
126
127 /* this function operates on one shell code frame of 16 pulses */
128 silk_assert( SHELL_CODEC_FRAME_LENGTH == 16 );
129
130 decode_split( &pulses3[ 0 ], &pulses3[ 1 ], psRangeDec, pulses4, silk_shell_code_table3 );
131
132 decode_split( &pulses2[ 0 ], &pulses2[ 1 ], psRangeDec, pulses3[ 0 ], silk_shell_code_table2 );
133
134 decode_split( &pulses1[ 0 ], &pulses1[ 1 ], psRangeDec, pulses2[ 0 ], silk_shell_code_table1 );
135 decode_split( &pulses0[ 0 ], &pulses0[ 1 ], psRangeDec, pulses1[ 0 ], silk_shell_code_table0 );
136 decode_split( &pulses0[ 2 ], &pulses0[ 3 ], psRangeDec, pulses1[ 1 ], silk_shell_code_table0 );
137
138 decode_split( &pulses1[ 2 ], &pulses1[ 3 ], psRangeDec, pulses2[ 1 ], silk_shell_code_table1 );
139 decode_split( &pulses0[ 4 ], &pulses0[ 5 ], psRangeDec, pulses1[ 2 ], silk_shell_code_table0 );
140 decode_split( &pulses0[ 6 ], &pulses0[ 7 ], psRangeDec, pulses1[ 3 ], silk_shell_code_table0 );
141
142 decode_split( &pulses2[ 2 ], &pulses2[ 3 ], psRangeDec, pulses3[ 1 ], silk_shell_code_table2 );
143
144 decode_split( &pulses1[ 4 ], &pulses1[ 5 ], psRangeDec, pulses2[ 2 ], silk_shell_code_table1 );
145 decode_split( &pulses0[ 8 ], &pulses0[ 9 ], psRangeDec, pulses1[ 4 ], silk_shell_code_table0 );
146 decode_split( &pulses0[ 10 ], &pulses0[ 11 ], psRangeDec, pulses1[ 5 ], silk_shell_code_table0 );
147
148 decode_split( &pulses1[ 6 ], &pulses1[ 7 ], psRangeDec, pulses2[ 3 ], silk_shell_code_table1 );
149 decode_split( &pulses0[ 12 ], &pulses0[ 13 ], psRangeDec, pulses1[ 6 ], silk_shell_code_table0 );
150 decode_split( &pulses0[ 14 ], &pulses0[ 15 ], psRangeDec, pulses1[ 7 ], silk_shell_code_table0 );
151 }

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